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In the figure given below a bar magnet m...

In the figure given below a bar magnet moving towards the right or left includes an `emf` in the coii `(1)`and `(2)` .Find giving reason thedirections of the induced currents through the resistors `AB` and `CD` when the magnet is moving `(a)` towards the right and `(b)` towards the left

Text Solution

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(a)When the magnet is moved towards right, the right end of coil `(1)` develps `S`-polarity and left end of coil `(2)` also develops south polarity i.e., current in both coils flow anticlockwise, in coil `(1)` current flows from `A` to `B` while in coil `(2)`,current flows from `D` to `C`
(b)When the magnet is moved towards left, the right end of coil `(1)` develps `N`-polarity and left end of coil `(2)` also develops `N`- polarity i.e., current in both coils flow clockwise, in coil `(1)` current flows from `B` to `A` while in coil `(2)`,current flows from `C` to `D`
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In the Fig. 6.22 given below, a bar magnet moving towards the right or left induces an emf in the coils (i) and (ii). Find, giving reason, the directions of the induced currents through the resistors AB and CD when the magnet is moving (a) towards the right and (b) towards the left.

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Knowledge Check

  • When a magnet is moved towards a coil the direction of induced current is clockwise. If the magnet is moved away from the coil, the direction of induced current will be

    A
    clockwise
    B
    anticlockwise
    C
    zero
    D
    any direction

  • The north pole of a bar magnet is moved swiftly downward towards a closed coil and then second time it is raised upwards slowly. The magnitude and direction of the induced currents in the two cases will be of

    A
    `{:("First case",,"Second case"),("Low value clockwise",,"Higher value anticlockwise"):}`
    B
    `{:("First case",,"Second case"),("Low value clockwise",,"Equal value anticlockwise"):}`
    C
    `{:("First case",,"Second case"),("Higher value clockwise",,"Low value clockwise"):}`
    D
    `{:("First case",,"Second case"),("Higher value anticlockwise",,"Low value clockwise"):}`

  • When a magnet is being moved towards a coil, the induced emf does not depend upon__

    A
    the number of turns of the coil
    B
    the motion of the magnet
    C
    the magnetic moment of the magnet
    D
    the resistance of the coil

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